arch/score/kernel/traps.c

   1 /*
   2  * arch/score/kernel/traps.c
   3  *
   4  * Score Processor version.
   5  *
   6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7  *  Chen Liqin <liqin.chen@sunplusct.com>
   8  *  Lennox Wu <lennox.wu@sunplusct.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see the file COPYING, or write
  22  * to the Free Software Foundation, Inc.,
  23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/sched.h>
  28
  29 #include <asm/cacheflush.h>
  30 #include <asm/irq.h>
  31 #include <asm/irq_regs.h>
  32 #include <asm/uaccess.h>
  33
  34 unsigned long exception_handlers[32];
  35
  36 /*
  37  * The architecture-independent show_stack generator
  38  */
  39 void show_stack(struct task_struct *task, unsigned long *sp)
  40 {
  41         int i;
  42         long stackdata;
  43
  44         sp = sp ? sp : (unsigned long *)&sp;
  45
  46         printk(KERN_NOTICE "Stack: ");
  47         i = 1;
  48         while ((long) sp & (PAGE_SIZE - 1)) {
  49                 if (i && ((i % 8) == 0))
  50                         printk(KERN_NOTICE "\n");
  51                 if (i > 40) {
  52                         printk(KERN_NOTICE " ...");
  53                         break;
  54                 }
  55
  56                 if (__get_user(stackdata, sp++)) {
  57                         printk(KERN_NOTICE " (Bad stack address)");
  58                         break;
  59                 }
  60
  61                 printk(KERN_NOTICE " %08lx", stackdata);
  62                 i++;
  63         }
  64         printk(KERN_NOTICE "\n");
  65 }
  66
  67 static void show_trace(long *sp)
  68 {
  69         int i;
  70         long addr;
  71
  72         sp = sp ? sp : (long *) &sp;
  73
  74         printk(KERN_NOTICE "Call Trace:  ");
  75         i = 1;
  76         while ((long) sp & (PAGE_SIZE - 1)) {
  77                 if (__get_user(addr, sp++)) {
  78                         if (i && ((i % 6) == 0))
  79                                 printk(KERN_NOTICE "\n");
  80                         printk(KERN_NOTICE " (Bad stack address)\n");
  81                         break;
  82                 }
  83
  84                 if (kernel_text_address(addr)) {
  85                         if (i && ((i % 6) == 0))
  86                                 printk(KERN_NOTICE "\n");
  87                         if (i > 40) {
  88                                 printk(KERN_NOTICE " ...");
  89                                 break;
  90                         }
  91
  92                         printk(KERN_NOTICE " [<%08lx>]", addr);
  93                         i++;
  94                 }
  95         }
  96         printk(KERN_NOTICE "\n");
  97 }
  98
  99 static void show_code(unsigned int *pc)
 100 {
 101         long i;
 102
 103         printk(KERN_NOTICE "\nCode:");
 104
 105         for (i = -3; i < 6; i++) {
 106                 unsigned long insn;
 107                 if (__get_user(insn, pc + i)) {
 108                         printk(KERN_NOTICE " (Bad address in epc)\n");
 109                         break;
 110                 }
 111                 printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'),
 112                         insn, (i ? ' ' : '>'));
 113         }
 114 }
 115
 116 /*
 117  * FIXME: really the generic show_regs should take a const pointer argument.
 118  */
 119 void show_regs(struct pt_regs *regs)
 120 {
 121         show_regs_print_info(KERN_DEFAULT);
 122
 123         printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 124                 regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3],
 125                 regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);
 126         printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 127                 regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11],
 128                 regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]);
 129         printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 130                 regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19],
 131                 regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]);
 132         printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 133                 regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27],
 134                 regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]);
 135
 136         printk("CEH : %08lx\n", regs->ceh);
 137         printk("CEL : %08lx\n", regs->cel);
 138
 139         printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n",
 140                 regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr,
 141                 regs->cp0_ecr, regs->cp0_condition);
 142 }
 143
 144 static void show_registers(struct pt_regs *regs)
 145 {
 146         show_regs(regs);
 147         printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n",
 148                 current->comm, current->pid, (unsigned long) current);
 149         show_stack(current_thread_info()->task, (long *) regs->regs[0]);
 150         show_trace((long *) regs->regs[0]);
 151         show_code((unsigned int *) regs->cp0_epc);
 152         printk(KERN_NOTICE "\n");
 153 }
 154
 155 void __die(const char *str, struct pt_regs *regs, const char *file,
 156         const char *func, unsigned long line)
 157 {
 158         console_verbose();
 159         printk("%s", str);
 160         if (file && func)
 161                 printk(" in %s:%s, line %ld", file, func, line);
 162         printk(":\n");
 163         show_registers(regs);
 164         do_exit(SIGSEGV);
 165 }
 166
 167 void __die_if_kernel(const char *str, struct pt_regs *regs,
 168                 const char *file, const char *func, unsigned long line)
 169 {
 170         if (!user_mode(regs))
 171                 __die(str, regs, file, func, line);
 172 }
 173
 174 asmlinkage void do_adelinsn(struct pt_regs *regs)
 175 {
 176         printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n",
 177                  regs->cp0_ema, regs->cp0_epc);
 178         die_if_kernel("do_ade execution Exception\n", regs);
 179         force_sig(SIGBUS, current);
 180 }
 181
 182 asmlinkage void do_adedata(struct pt_regs *regs)
 183 {
 184         const struct exception_table_entry *fixup;
 185         fixup = search_exception_tables(regs->cp0_epc);
 186         if (fixup) {
 187                 regs->cp0_epc = fixup->fixup;
 188                 return;
 189         }
 190         printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n",
 191                  regs->cp0_ema, regs->cp0_epc);
 192         die_if_kernel("do_ade execution Exception\n", regs);
 193         force_sig(SIGBUS, current);
 194 }
 195
 196 asmlinkage void do_pel(struct pt_regs *regs)
 197 {
 198         die_if_kernel("do_pel execution Exception", regs);
 199         force_sig(SIGFPE, current);
 200 }
 201
 202 asmlinkage void do_cee(struct pt_regs *regs)
 203 {
 204         die_if_kernel("do_cee execution Exception", regs);
 205         force_sig(SIGFPE, current);
 206 }
 207
 208 asmlinkage void do_cpe(struct pt_regs *regs)
 209 {
 210         die_if_kernel("do_cpe execution Exception", regs);
 211         force_sig(SIGFPE, current);
 212 }
 213
 214 asmlinkage void do_be(struct pt_regs *regs)
 215 {
 216         die_if_kernel("do_be execution Exception", regs);
 217         force_sig(SIGBUS, current);
 218 }
 219
 220 asmlinkage void do_ov(struct pt_regs *regs)
 221 {
 222         siginfo_t info;
 223
 224         die_if_kernel("do_ov execution Exception", regs);
 225
 226         info.si_code = FPE_INTOVF;
 227         info.si_signo = SIGFPE;
 228         info.si_errno = 0;
 229         info.si_addr = (void *)regs->cp0_epc;
 230         force_sig_info(SIGFPE, &info, current);
 231 }
 232
 233 asmlinkage void do_tr(struct pt_regs *regs)
 234 {
 235         die_if_kernel("do_tr execution Exception", regs);
 236         force_sig(SIGTRAP, current);
 237 }
 238
 239 asmlinkage void do_ri(struct pt_regs *regs)
 240 {
 241         unsigned long epc_insn;
 242         unsigned long epc = regs->cp0_epc;
 243
 244         read_tsk_long(current, epc, &epc_insn);
 245         if (current->thread.single_step == 1) {
 246                 if ((epc == current->thread.addr1) ||
 247                     (epc == current->thread.addr2)) {
 248                         user_disable_single_step(current);
 249                         force_sig(SIGTRAP, current);
 250                         return;
 251                 } else
 252                         BUG();
 253         } else if ((epc_insn == BREAKPOINT32_INSN) ||
 254                    ((epc_insn & 0x0000FFFF) == 0x7002) ||
 255                    ((epc_insn & 0xFFFF0000) == 0x70020000)) {
 256                         force_sig(SIGTRAP, current);
 257                         return;
 258         } else {
 259                 die_if_kernel("do_ri execution Exception", regs);
 260                 force_sig(SIGILL, current);
 261         }
 262 }
 263
 264 asmlinkage void do_ccu(struct pt_regs *regs)
 265 {
 266         die_if_kernel("do_ccu execution Exception", regs);
 267         force_sig(SIGILL, current);
 268 }
 269
 270 asmlinkage void do_reserved(struct pt_regs *regs)
 271 {
 272         /*
 273          * Game over - no way to handle this if it ever occurs.  Most probably
 274          * caused by a new unknown cpu type or after another deadly
 275          * hard/software error.
 276          */
 277         die_if_kernel("do_reserved execution Exception", regs);
 278         show_regs(regs);
 279         panic("Caught reserved exception - should not happen.");
 280 }
 281
 282 /*
 283  * NMI exception handler.
 284  */
 285 void nmi_exception_handler(struct pt_regs *regs)
 286 {
 287         die_if_kernel("nmi_exception_handler execution Exception", regs);
 288         die("NMI", regs);
 289 }
 290
 291 /* Install CPU exception handler */
 292 void *set_except_vector(int n, void *addr)
 293 {
 294         unsigned long handler = (unsigned long) addr;
 295         unsigned long old_handler = exception_handlers[n];
 296
 297         exception_handlers[n] = handler;
 298         return (void *)old_handler;
 299 }
 300
 301 void __init trap_init(void)
 302 {
 303         int i;
 304
 305         pgd_current = (unsigned long)init_mm.pgd;
 306         /* DEBUG EXCEPTION */
 307         memcpy((void *)DEBUG_VECTOR_BASE_ADDR,
 308                         &debug_exception_vector, DEBUG_VECTOR_SIZE);
 309         /* NMI EXCEPTION */
 310         memcpy((void *)GENERAL_VECTOR_BASE_ADDR,
 311                         &general_exception_vector, GENERAL_VECTOR_SIZE);
 312
 313         /*
 314          * Initialise exception handlers
 315          */
 316         for (i = 0; i <= 31; i++)
 317                 set_except_vector(i, handle_reserved);
 318
 319         set_except_vector(1, handle_nmi);
 320         set_except_vector(2, handle_adelinsn);
 321         set_except_vector(3, handle_tlb_refill);
 322         set_except_vector(4, handle_tlb_invaild);
 323         set_except_vector(5, handle_ibe);
 324         set_except_vector(6, handle_pel);
 325         set_except_vector(7, handle_sys);
 326         set_except_vector(8, handle_ccu);
 327         set_except_vector(9, handle_ri);
 328         set_except_vector(10, handle_tr);
 329         set_except_vector(11, handle_adedata);
 330         set_except_vector(12, handle_adedata);
 331         set_except_vector(13, handle_tlb_refill);
 332         set_except_vector(14, handle_tlb_invaild);
 333         set_except_vector(15, handle_mod);
 334         set_except_vector(16, handle_cee);
 335         set_except_vector(17, handle_cpe);
 336         set_except_vector(18, handle_dbe);
 337         flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR);
 338
 339         atomic_inc(&init_mm.mm_count);
 340         current->active_mm = &init_mm;
 341         cpu_cache_init();
 342 }